I recently bought a Bepro power meter from bikefast.co.uk so that I can now accurately quantify how bad I am at cycling (and do intervals and pace myself better) but mostly so I have more numbers and graphs to look at.
This is just a heads up for anyone thinking about buying a power meter that these are available in the uk now. They are a pedal based system and the single sided version is only £390 which compares very favourably with other systems. Dcrainmaker has a good review if anyone is interested.